Spring Trees

The four photos here, this and three insets, are all of spring growth on trees including flowers, seeds and catkins. These are the flowers of a Norway Maple, not a native tree, but I do not know what trees the others represent, however, and have neither the resources nor opportunity to try to identify them, since they were all photographed in Michigan and we, of course, live in Washington. In fact, I am not home now but in western Washington and have to lead a field trip a little later today for the Washington Native Plant Society. If anyone recognizes these trees I would appreciate the help.